sd_journal_get_usage  762 src/journal-remote/journal-gatewayd.c         r = sd_journal_get_usage(m->journal, &usage);
sd_journal_get_usage 1816 src/journal/journalctl.c                 r = sd_journal_get_usage(j, &bytes);
sd_journal_get_usage  125 src/systemd/sd-journal.h int sd_journal_get_usage(sd_journal *j, uint64_t *bytes);